Reciprocating bed motion for flat bed presses



Jan. 11, 1938. F. R. MOLITOR RECIPROCATING BED MOTiON FOR FLAT BEDPRESSES Filed Dec. 50, 1936 INVENTOR Fr-ecle 'L] BY WITNESSES IrickJLJYloZii'Or Patented Jan. 11, 1938 PATENT OFFICE RECIPROOATING BEDMOTION FOR FLAT BED PRESSES Frederick R. Molitor, New York, N. Y.

Application December 30, 1936, Serial No. 118,287

3 Claims.

This invention relates to printing presses, and particularly to areciprocating bed motion for ilat bed presses, the object being toprovide an improved simplified construction of means for 5 moving thebed and associated parts.

Another object of the invention is to provide a reciprocating bed motionwhich permits an impression to be made upon each complete revolution ofthe impression cylinder.

10 A further object, more specifically, is to provide a reciprocatingmotion for fiat bed presses wherein the impression cylinder and the bedare so intergeared that the bed will move on its forward stroke duringthe first half of the revolu- 15 tion of the impression cylinder andwill move on the return stroke upon the second half of the revolution ofthe impression cylinder.

In the accompanying drawing:

Fig. 1 is a fragmentary side elevation illustrat- 2 ing an embodiment ofthe invention;

Fig. 2 is a fragmentary sectional view through Fig. 1 approximately onthe line 22;

Fig. 3 is a fragmentary sectional view through Fig. 1 approximately onthe line 33, the same 25 being on a slightly enlarged scale.

Referring to the accompanying drawing by numerals, indicates a frame ofa flat bed press. This press may be of any desired type, as for instanceof the type known as the Miehle flat bed 30 printing machine. Thismachine is provided with a bed 2 of the usual kind and an impressionroll 3 of the usual kind. It will be understood that paper sheets arefed to the machine in the usual way and as the bed 2 reciprocates 35 thesheets will be printed upon successively. The bed 2 may be supported andguided by suitable members 4 and has a rack 5 rigidly secured thereto,preferably on the under surface.

A bed gear wheel 6 continually meshes with 40 rack 5 and acts as meansfor moving the rack. Gear wheel 6 is keyed or otherwise rigidly securedto shaft 1, to which is keyed or otherwise secured a pinion 8. Acomparatively large loose gear Wheel 9 is mounted on the shaft 1 and isrotat- 45 ably mounted between pinion 8 and abutment Ill. The loose gearwheel 9 continually meshes with the roller gear H which is connectedthrough shaft l2 with the impression drum 3 so as to rotate therewith. Adriving disk I3 is also keyed or 0 otherwise rigidly secured to shaft l2so as to rotate therewith.

As shown in Fig. 1, a driving pinion |4 continually meshes with theloose gear 9, said pinion being rigidly connected with shaft I5, to

65 which a pulley I6 is also rigidly secured. Pulley I6 accommodates thedriving belt I"! passing .over the small pulley l8 driven by the primemover IS. The prime mover I9 is usually an electric motor and acts toprovide power for driving the various parts just described. It will beobserved that when the motor I9 is functioning the various gear Wheelsjust described will be rotating. As the pinion l3 rotates it willnaturally move the wrist pin 20 in a circle. Wrist pin 20 is rotatablymounted in a link 2| which is pivotally connected at 22 to an arm 23.Arm 23 is rigidly secured to a hollow shaft 24 as shown in Fig. 3. Asecond arm 25 is also rigidly secured to hollow shaft 24 so that thearms 23 and 25 will move in unison. These arms are each provided with aslot 26 through which the respective pins 2'! and 28 extend. Theserespec tive pins are adapted to be clamped tightly to the respectivearms, while allowing the respective links 2| and 29 to freely swing.

Link 29 is connected through a journal pin 30 to the arm 3|. Journal pin30 also extends through the power link 32 so that when the arm 3|swings, power link 32 will be reciprocated. It will be understood thatthe pin 30 is similar to the pin 28 and is rigidly clamped to the arm 3|in a slot 33, while at the same time allowing a proper swinging movementof links 29 and 32. The power link 32 is pivotally connected at 34 to arack 35 which is continually in mesh with the pinion 8, whereby saidpinion is moved back and forth as link 32 functions. Rack is providedwith an arm 36 which is preferably integral therewith, said arm beingjournaled on the hollow shaft 24 as shown in Fig. 3. 35

A standard 31 is carried by frame I and rigidly secured thereto in anydesired manner, said standard accommodating the pin 38 as shown in Fig.3, said pin being rigidly secured to the standard by the set screw 39.Standard 40 supports 40 the pin 4| in a similar manner to that shown inFig. 3. Arm 3| is loosely mounted on pin 4| so as to readily swing. Thevarious slots 42, 26 and 33 permit a desired adjustment of therespective parts so that a proper action is secured. A rod 43 ispivotally connected at 44 to arm 36 and loosely passes through anabutment 45. A spring 46 acts against abutment 45 and a stop 47. Spring46 is under tension at all times and tends to balance the weight of therespective parts 50 while at the same time giving a slight tendency torack 35 to move from the position shown in Fig. 1 to the left.

By reason of the construction just described, when the motor I9 isfunctioning the various parts will also function and cause the bed 21 toreciprocate, while the impression cylinder 3 rotates always in the samedirection. For the first half of the rotation of the impression cylinder3, bed 2 will move forward to its extreme position, and then on thesecond half or completion oif the rotation, bed 2 will move back to itsfirst or starting position. It will therefore be seen that upon eachrevolution of the impression cylinder, one sheet of paper is printed.

I claim:

1. A reciprocating bed motion for flat bed presses including a racksecured to the bed of the press, a gear wheel continually meshing withsaid rack, means for driving said gear Wheel;

saidlbed to function, said means including a disk secured'to saidcylinder so as to rotate therewith, a journal pin carried by said diskand positioned 'to'move in a circle when said disk rotates, a

substantially reciprocating link'having one end journaled on said pin, asegmental rack provided with an arm extending normal thereto, means forpivotally mounting the free end of said arm, link mechanism connected toone-end of said link and to one end of said segmental rack forreciprocating said rack, a pinion continually meshing with saidsegmental rack, a bed rack secured to said bed, and a gear wheel-rigidlysecured to said pinion for meshing with said bed rack.

3. The combination with a fiat bed press having an impression cylinderand a reciprocating bed, of means for causing said bed to have onecomplete cycle of action upon one revolution of said cylinder, saidmeans including a rack secured to said bed, a primary gear wheel securedto said cylinder, an idler gear continually meshing with said primarygear wheel, a pinion continually meshing with said idler gear, powermeans for rotating said pinion, a rack actuating gear continuallymeshing with said rack, a pinion rigidly connected with said rackactuating gear, a segmental rack continually meshing with saidsecond-mentioned pinion, said segmental rack having an arm extendingnormal thereto, means at the outer end of said arm for pivotallysupporting the arm so that said segmental rack will continually meshwith said second-mentioned pinion, a substantially reciprocating linkhaving one end pivotally connected to said cylinder so that as saidcylinder rotates said link will reciprocate,.a power link having one endpivotally secured to said segmental rack near one end, an arm having oneend pivotally connected to the outer end of said power link and theopposite end pivotally mounted in a fixed position,

and means forconnecting the outer end of ,said,,

reciprocating link with the joint, of said power link and said arm sothat as said reciprocating Y FREDERICK R. MOLITOR.

